Flexible cement gun nozzle attachment



Sept 11?, 1935. T, VAWTER ZUIAJU FLEXIBLE CEMENT GUN NOZZLE ATTACHMENT Original Filed Dec. 10, 1929 AWE/v70)? 12% Z? Vaw fer 5 y 2 km! ATTO/PA/i Patented Sept. 17, 1935 cries FLEXIBLE CEMENT GUN NOZZLE ATTACHMENT John T. Vawter, Los Angeles, Calif.

Application December 10, 1929, Serial No. 413,045 Renewed January 22, 1935 1 Claim.

This invention relates to cement gun equipment and deals with a nozzle for use in connec-- tion therewith, which controls the shape of the cross-section of the stream of material issuing therefrom.

In cement gun practice, it frequently happens that the operator is called upon to produce comparatively sharp corners such as the meeting of two Walls or walls with ceilings or floors, angles, and lines such as arises of mouldings, fillets, and the sharp line around door and window openings. Also, ornamental forms are often required to be covered or molded in place. The covering of pipe systems for the purpose of insulation or protection is also a large field for the application of my invention.

The hose nozzles now in general use by cement gun operators, due to the non-flexible orifice for the issuance of the stream of materials therefrom, are not adaptable for directing a stream of material onto any definite or precise surface. For a broad flat surface, the nozzle of the present day type is well adapted, however, there are occasions when a stream of a well defined shape and size is required; for instance, in finishing around a door or window opening a broad fiat stream which may be thinned down to treat a surface approaching a line is highly desirable. This shape of stream is also highly successful in shooting pipe. There are other occasions, particularly in treating ornamental work, when a thin attenuated pencil-like stream of material is highly desirable and effective. Other occasions may arise where an irregular V shaped stream may be extremely useful. I am aware that a plurality of nozzles having orifices of definitely fixed shape may be produced, each nozzle being particularly adapted for a certain purpose, but the time and inconvenience re-- quired to change nozzles for each particular purpose becomes irksome and eventually prohibitive of their use. It is, therefore, an object of this invention to provide an orifice for a cement gun nozzle characterized by being manipulatably flexible.

In addition to improving the ordinary cement gun nozzle for work of the character described, my device opens a new field of activity for the use of cement gun equipment.

The details in the construction of certain preferred forms of my invention, together with other objects attending its production, will be best understood from the following description of the accompanying drawing which is chosen for illustrative purposes only, and in which Fig. 1 is a perspective View of a device embodying a form of my invention; and

Fig. 2 is a view similar to Fig. 1 but showing the longitudinal axis of the orifice in a different plane from that shown in Fig. 1. 5

Referring now to the drawing, the form of my invention illustrated in Fig. 1 shows a nozzle structure wherein the shape of the orifice is mechanically controlled. In this embodiment it will be understood that an extending flexible 10 nozzle tip 25 may be formed integrally with the hose proper by the use of a rigid mechanical clamp means designated in its entirety by reference numeral 22. In this form of my invention the clamp means 22 not only holds the nozzle rigid but it also forms the nozzle orifice 23 into a fixed shape. Furthermore, the clamp member is formed so as to bend the hose in the manner 10Wl1, thereby bringing into operation a centrifugal action which separates the material particles from the air or conveying medium due to the difference in the specific gravity between the two. The particles, due to their mass and velocity, will seek the outer radius of the bend and separate from the air. The air on the inner 25 circumference will thus be cleared of the material being conveyed and, due to its pressure, it will expand outwardly through an opening 2% provided on the short radius of the bend. This will reduce the volume of air passing through the orifice of the nozzle which, in turn, reduces the air erosion on the surface of the deposition, as well as reducing the particle velocity which, in turn, decreases the rebound of the particles.

As is well known to those familiar with the art,

the features of decreasing air erosion and rebound of material projected is of great importence to cement gun practice. Further details regarding the principle involved, so far as these two results are concerned, may be found in 40 United States Letters Patent No; 1,885,645, issued to me on January 4, 1930.

Fig. 2 shows an arrangement which is similar in principle to that discussed above, but the nozzle shown in Fig. 2 differs from the former in that the axis of the orifice is revolved through substantially 90 with relation to the orifice in. Fig. 1. Furthermore, in this latter form of my invention I show a plurality of openings 25 on the short. radius of the bend.

These two forms of my invention illustrate the possibilities of its application. Since it is obvious that the necessity exists for streams of well defined and different shapes, it will be evident that a great variety of shapes may be required. This invention, therefore, although dealing with a variety of shapes for various purposes, is to be considered as being more concerned with a means for producing such shapes than with the 5 shapes, per se.

I claim as my invention: In combination with a material-conveying flexible hose: a bracket adapted to be mounted on said hose and form a bend therein; an air outlet in the wall of the hose corresponding to the short radius of the bend; and means on said bracket for shaping the open end of the hose 5 into a nozzle orifice.

JOHN T. VAWTER. 

